quadriphase

quadriphase

[′kwäd·rə‚fāz]
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All these factors being considered, the signal chosen was an offset quadriphase shift keyed (OQPSK) signal with the basic bit pulse, p(t), given by
This article discusses a constant carrier output modulation format called Nyquist quadrature frequency shift keying (NQFSK) that presents a perfect quadriphase eye pattern at the transmitter output and achieves excellent spectral containment.
3] It uses a strictly bandlimited 4-level frequency modulating symbol pulse to achieve a perfect quadriphase eye pattern at the transmitter output.
7] The spectral degradation from hard-limiting of a non-constant carrier envelope offset quadriphase shift keyed (OQPSK) type data signal has also been the subject of some investigation.
That property defines a perfect quadriphase eye pattern.
The effects of filter distortion on intersymbol interference for coherently detected biphase and quadriphase phase-shif-keyed (BPSK and QPSK) signals have been studied Bit error rate (BER) degradation is minimal for an amplitude ripple of less than 0.